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Hubble constant

British

noun

Also called: Hubble parameter. the rate at which the expansion velocity of the universe depends on distance away. It is currently estimated to lie in the range 60–80 km s ^–1 megaparsec ^–1

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Different methods produce conflicting values for the Hubble constant, the number used to describe how fast the universe is expanding.

From Science Daily • Mar. 16, 2026

In their latest work, Yunes, Cousins, and their colleagues describe a new way to estimate the Hubble constant by studying black hole collisions that current detectors cannot individually pick up.

From Science Daily • Mar. 1, 2026

Ideally, all these techniques would point to the same Hubble constant.

From Science Daily • Mar. 1, 2026

When scientists analyze the CMB to estimate the Hubble constant, they obtain a lower value of 67 km/s/Mpc.

From Science Daily • Dec. 9, 2025

Thus when astronomers refer to a Hubble constant of 50, what they really mean is "50 kilometers per second per megaparsec."

From "A Short History of Nearly Everything" by Bill Bryson

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023